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A liquid drop impacting a solid surface may splash by emitting a thin liquidsheet that subsequently breaks apart or by promptly ejecting droplets from theadvancing liquid-solid contact line. Using high-speed imaging, we show that airpressure and surface roughness influence both splash mechanisms. Roughnessincreases prompt splashing at the advancing contact line but inhibits theformation of the thin sheet. If the air pressure is lowered, droplet ejectionis suppressed not only during thin-sheet formation but for prompt splashing aswell. The threshold pressure depends on impact velocity, liquid viscosity andsurface roughness.

Creation of prompt and thin-sheet splashing by varying surface roughness or increasing air pressure